Smart invoicing for modern businesses

Essentio is invoicing software for European businesses: create, send and get paid for invoices — or just ask your AI assistant to do it. EU VAT compliant, designed for numbers.

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Start free, no card needed.

Claude

Who still owes me money?

  1. Found the Invoices not paid yet
  2. Checked their due dates

Overdue

2 Invoices
INV-2026-0031Bluebell Catering
€499.8022 days overdue
INV-2026-0036Quarry Street Dental
€309.4015 days overdue
Total owed
€809.20

Invoice ACME Ltd 500 € for the October retainer and send it

  1. Found ACME Ltd
  2. Drafted Invoice · €500.00 + VAT 19% = €595.00
  3. Issued INV-2026-0042
  4. Sent to accounts@acme.example

INV-2026-0042

Invoice for ACME Ltd

Sent

Total

€595.00

What VAT do I owe for September?

  1. Read September’s VAT report

VAT · September 2026

Reported VAT
€1,140.00
Income
€6,000.00 net

Ready for your return.

Everything you need

The features that carry an invoice from draft to paid.

  • Smart invoicing

    Create professional invoices in seconds, with exact calculations, automatic numbering and multi-currency support.

  • Ask your AI assistant

    Connect Claude or ChatGPT and ask it to draft, issue and send an invoice, record a payment or tell you a month’s VAT.

  • Public API and Webhooks

    On the paid plans, a REST API and signed webhooks connect Essentio to your own systems.

  • EN16931 compliant

    Export issued invoices and credit notes as EN 16931 UBL XML, proforma prepayments included.

  • Global VAT verification

    Real-time VAT checks for 29 countries — EU VIES, Norway and New Zealand — against the official registries.

  • Payments and receipts

    Record payments against your invoices and proformas; each one gets its numbered receipt, ready to email to your Client.

  • Sends from Essentio

    Email documents from Essentio’s own mail server, with replies going to your address — or connect your Gmail, Outlook or SMTP mailbox.

  • Test business

    Try things out in a Test business: its documents are marked as samples, the documents it emails reach only you, and a reset starts it afresh.

  • Built for trust

    Your data is stored on servers in Germany, in the EU, and served over TLS, with every read and write scoped to your Business.

Connect your AI assistant

Essentio works in Claude and ChatGPT. Connect it once, then ask in your own words.

  • Claude

    Opens Claude with Essentio filled in as a custom connector.

    Add Essentio to Claude

    Or in Claude: Customize → Connectors → Add custom connector → https://mcp.essentio.pro

  • Claude Code

    The plugin brings the Essentio connector and two skills: draft and send an Invoice, and close a month's VAT.

    /plugin marketplace add essentio-pro/essentio-plugin
    /plugin install essentio@essentio

    Then run /mcp to sign in to Essentio.

    Connector only: claude mcp add --transport http essentio https://mcp.essentio.pro

  • ChatGPT

    Opens Essentio's page in ChatGPT's plugin directory.

    Open Essentio in ChatGPT

  • Developers

    On the paid plans, connect Essentio to your own systems.

    Public API and Webhooks

Global VAT verification

Validate VAT numbers in real time against the official registries of 29 countries.

EU countries
27
VIES lookups for every European Union member state
beyond the EU
2
Official Brønnøysund and NZBN registry checks
countries in total
91
Format validation for VAT numbers worldwide
A new client's VAT number is verified against the registry and the Client's name and address are filled in from it
Real-time VAT verification with registry auto-fill

How it works

  1. Enter a VAT number

    Type or paste any VAT number from 29 supported countries.

  2. Verified in real time

    The number is checked against the official government registry.

  3. Registry details retrieved

    Name, address and registration come back from the registry.

  4. Client filled in and verified

    The client record is populated and marked as verified.

Why Essentio?

Built for European businesses with compliance, security and ease of use in mind.

  • Free plan, no card needed
  • Invoices from your AI assistant
  • Public API and Webhooks on paid plans
  • Automated document numbering
  • Client and product management
  • EN16931 compliant XML export
  • Proforma to final invoice workflow
  • Real-time VAT verification (29 countries)
  • PDF export with your own branding
  • Email from Essentio or your own mailbox
  • Public invoice links with one-click PDF
  • Know when a document is sent, viewed and paid
  • Your whole Business in one Business Archive
  • Works on any screen size

invoice_INV-2026-0042.xml 

<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema...">
  <cbc:CustomizationID>
    urn:cen.eu:en16931:2017#compliant#...
  </cbc:CustomizationID>
  <cbc:ID>INV-2026-0042</cbc:ID>
  <cbc:IssueDate>2026-10-11</cbc:IssueDate>

  <cac:BillingReference>
    <cac:InvoiceDocumentReference>
      <cbc:ID>PF-2026-0001</cbc:ID>
    </cac:InvoiceDocumentReference>
  </cac:BillingReference>

  <cac:LegalMonetaryTotal>
    <cbc:TaxInclusiveAmount>1000.00</cbc:TaxInclusiveAmount>
    <cbc:PrepaidAmount>300.00</cbc:PrepaidAmount>
    <cbc:PayableAmount>700.00</cbc:PayableAmount>
  </cac:LegalMonetaryTotal>
</Invoice>

EN16931 UBL 2.1 export, including the proforma prepayment (BT-113, BT-115).

Pricing

Simple tool, simple pricing. No bloated tiers, no features you'll never use.

Prices in euro.

Free

For one Business getting started.

€0.00/ month excl. VAT

  • 1 Business
  • You and any number of Viewers
  • 5 Invoices a month, shared by every Free Business with the same VAT number or TAX ID
  • “Made with Essentio” on your documents
Start free

Pro

Everything, for one Business.

€15.00/ month excl. VAT

  • Any team: Admins, Members, Viewers
  • Public API and Webhooks
  • No Issuing limit
  • No “Made with Essentio” mark
Start with Pro

Ready to simplify your invoicing?

Set up your business, add a client and send your first invoice today.

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